View Full Version : Vibrating image with 'Daniel's" DIY adapter?
2007 October 22nd, 20:38
As the other thread (http://www.hv20.com/showthread.php?t=489) has been quite 'dead' lately and my question, which is very important to me, remained unanswered, I decided to try my luck in a new thread. I hope it's not considered cross-posting.
I completed my vibrating DOF adapter following Daniel's tutorial. While assembling, I accidently broke some of the carbon pins which allow the vibration of the GG holder. I managed to fix them with glue (both component and super glue).
However, when I turn on the vibration, not only the GG holder but the whole adapter and therefore the image is vibrating and shakey, even on the lowest vibration setting using the potentiometer. Increasing the speed makes it even worse.
Did anyone else experience this problem? I noticed in one of Halsu's clips a similar effect: a strange 'wobble', like a wave floating through the image. I get the same effect when I increase shutter speed during vibration.
Of course I suspect my 'fixed' carbon pins to be the cause of this, though I'm not 100% sure and would like to hear if anyone else experienced similar issues.
Using the adapter as a static one is an option of course, but there are some small spots of dust on my ground glass I can't seem to get rid of. And I don't like the idea of having to dissemble the adapter every week just to clean the glass.
Any ideas? Thanks in advance for any hints!
2007 October 23rd, 03:24
while reading the instruction i didn't quite understand what the pins were until i broke one of them. i fixed using hot glue and glue it to the point where it can never be broken again. no issue with quality of the picture, but some how my glass is not perfectly aligned. it is up too high. is this normal?
2007 October 23rd, 22:32
From what I understand it's not the glass' fault, but it's because the CMOS sensor of the HV20 is not well centered. My glass appears too high as well.
But maybe other's can shed some light on this and tell us how their glasses appear?
2007 October 24th, 02:45
I thought the sensor was horizontally displaced, not vertically. But maybe it's a combination of both?
2007 October 25th, 18:58
now that Im back from holiday I can keep on working.
1. Your problem can be caused by different things.
A. Turn off your image stabilizer!!!
B. Your broken pins
C. Vibration is too high. Also use a lens support holder or some rails with your HV20?
D. Dont use shutter speeds above 1/50!
2. The CMOS sensor of the HV20 is not well aligned that differs from HV20 to HV20. In example my CMOS is displaced a little bit at the right upper corner. I need to zoom in a little more to get rid of this. You can also try to make some holder that allows to adjust the achromat horizontally or vertically by 1-2mm.
PS. Because I had complaints from people who broken their pins of the gg-holder I built a VH-57X with new steel pins and it worked perfectly. The vibration pattern is just a little bit smaller then with carbon pins buts its still enough to eliminate the grain and dust particles. From this time the VH-57X will be delivered with steel pins.
2007 November 14th, 11:27
2. The CMOS sensor of the HV20 is not well aligned that differs from HV20 to HV20. In example my CMOS is displaced a little bit at the right upper corner.
Just wondering, but does anyone have any idea whether this alignment issue might not be due to the optical image stabilizer? I mean since we all know that there is some element moving around in there that you can hear when the camera is off, maybe the alignment changes depending on where the image stabilized element settles...
(OK, maybe not, but I thought it might be worth throwing it out there. :hv20-smilie02:)
2007 November 14th, 11:40
The CCD in my MVX40 is also off-centre. That, too, has OIS. But I don't think that is the reason it is off-centre.
2007 November 14th, 15:09
i am having the same problem at the moment. the vibration is too strong.
i am going to try and experiment with a lower power AA battery or try and secure the tube.
2007 November 14th, 19:25
With some help of twoneil, I was able to figure out that the 'vibrating image' problem is not caused by the vibration being too strong, but by being simply wrong, call it 'wobbly'. The wobble will spread to the rest of the adapter and cause the issues.
With my adapter, I need a certain (not too low) speed to get proper vibration and it doesn't kick in immediately. I have to push it to the max to make it find the 'right pace', then I can turn it down again, but not too much or it will lose it again.
I'm not too sure what caused the problem with my adapter, but by twisting, turning, pulling and pushing the motor itself, I got it to work eventually.
2007 November 15th, 10:34
Dont use shutter speeds above 1/50!
i use my vibrating adapter (VH-57X) with 1/250 or 500 shutter speed and no problem.. the picture very clear
2007 November 17th, 11:53
fletch! thank you so much! i increased the speed and played around with it while watching on a HD screen to see any change. It wasnt working and then all of a sudden it kinda snapped into alignment and stopped blurring. Its now too dark to test it out properly but i have a really good feeling that tomorrow is going to give me some really good results.
i was about to give up, thinking i didnt have enough time to test it out anymore as im writing a short film at the moment and was starting to think about losing the adapter. but this has encouraged me to carry on, so thankyou
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